In 1863, Hijikata Toshizo joined the roshigumi militia, formed to escort the shogun to Kyoto, alongside Kondo Isami. Denzuin was where this group assembled before departing for Kyoto, and it later became the foundation of the Shinsengumi. As vice-commander, Hijikata enforced strict discipline, earning the nickname "Oni no Fukucho" (Demon Vice-Commander).